| Place Name | Fairfield |
| Place Type | City |
| ZIP Code(s) | 52556 |
| County | Jefferson County |
| Area Code(s) | 641 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 9,462 |
| Population Growth Rate (2010-19) | -0.51% |
| Majority Ethnicity | White 76.61% |
| Metro/Micro Stats Area | Fairfield, IA |
| US Congressional District(s) | Iowa 2nd |
| State House Districts | 82,84 |
| State Senate Districts | 41,42 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 76.61% |
| African American | 10.44% |
| Hispanic | 0.11% |
| Asian | 8.53% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 4.31% |